DE2632323B2 - Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves - Google Patents

Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves

Info

Publication number
DE2632323B2
DE2632323B2 DE19762632323 DE2632323A DE2632323B2 DE 2632323 B2 DE2632323 B2 DE 2632323B2 DE 19762632323 DE19762632323 DE 19762632323 DE 2632323 A DE2632323 A DE 2632323A DE 2632323 B2 DE2632323 B2 DE 2632323B2
Authority
DE
Germany
Prior art keywords
plate thickness
transmitter
sheet metal
pulse
metal strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19762632323
Other languages
German (de)
Other versions
DE2632323C3 (en
DE2632323A1 (en
Inventor
Hans Paassen
Hans Smit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thyssen Niederrhein AG
Original Assignee
Thyssen Niederrhein AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thyssen Niederrhein AG filed Critical Thyssen Niederrhein AG
Priority to DE19762632323 priority Critical patent/DE2632323C3/en
Priority to FR7721628A priority patent/FR2358658A1/en
Priority to IT2566777A priority patent/IT1084949B/en
Priority to JP8306977A priority patent/JPS5312386A/en
Publication of DE2632323A1 publication Critical patent/DE2632323A1/en
Publication of DE2632323B2 publication Critical patent/DE2632323B2/en
Application granted granted Critical
Publication of DE2632323C3 publication Critical patent/DE2632323C3/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G01N29/341—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics
    • G01N29/343—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics pulse waves, e.g. particular sequence of pulses, bursts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0421—Longitudinal waves

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Ultraschallprüfung von plattenförmigen Körpern, insbesondere Blechband, nach dem Impuls-Echo-Verfahren mit Lambwellen, bestehend aus einem einen Sender und einen Empfänger aufweisenden Ultraschallprüfkopf, wobei die konstante Frequenz eines Ultraschallschwingers für den Sender und für den Empfänger für jeweils einen anderen Plattendickenbereich so gewählt wird, daß das Produkt aus der Frequenz und dem zugeordneten Plattendickenbereich im wesentlichen konstant ist.The invention relates to a device for ultrasonic testing of plate-shaped bodies, in particular Sheet metal strip, using the pulse-echo method with Lamb waves, consisting of a one Transmitter and a receiver having ultrasonic probe, the constant frequency of a Ultrasonic transducer for the transmitter and for the receiver for a different plate thickness range is chosen so that the product of the frequency and the associated plate thickness range is essentially constant.

Bei einer bekannten Vorrichtung dieser Art (das Industrieblatt, Stuttgart, Oktober 1958, Seiten 427 und 428) werden für die verschiedenen Plattendikkenbereiche offensichtlich unterschiedliche Ultraschallprüfköpfe mit jeweils entsprechend angepaßten Schwingerfrequenzen bereitgestellt. Eine niedrigste mögliche gleichbleibende Fehlernachweisgrenze für alle Plattendicken ist hierbei nicht gewährleistet. Das gilt auch dann, wenn bei Anwendung der Grundwelle das Produkt aus Frequenz und Plattendicke im Lambwellenbereich oberhalb etwa 80 kHz - cm liegt (das Industrieblatt, Stuttgart, Januar 1960, Seiten 1 bis 7).In a known device of this type (the Industrieblatt, Stuttgart, October 1958, pages 427 and 428) will obviously have different ultrasonic probes for the different plate thickness ranges provided with correspondingly adapted oscillator frequencies. A lowest a possible constant defect detection limit for all panel thicknesses is not guaranteed. That also applies if the product of frequency and plate thickness is in the Lamb wave range when the fundamental wave is used above about 80 kHz - cm (the Industrieblatt, Stuttgart, January 1960, pages 1 to 7).

Der Erfindung liegt die Aufgabe zugrunde, anzugeben, wie man mit einer gattungsgemäßen Vorrichtung für alle Plattendicken eine niedrigst mögliche gleichbleibende Fehlernachweisgrenze sicherstellen kann.The invention is based on the object of specifying how to use a generic device can ensure the lowest possible constant defect detection limit for all panel thicknesses.

Zur Lösung dieser Aufgabe lehrt die Erfindung, daß der Sender und der Empfänger je aus einer Mehrzahl von jeweils einem anderen Plattendickenbereich zugeordneten Schwingern besteht, die jeweils an den regelmäßig zugeordneten Innenflächen eines Vieleckhohlkörpers rechteckigen Querschnitts befestigt und vermittels eines den Vieleckkörper drehenden Verstellantriebs in Sende- bzw. Empfangslage verstellbar sind.To solve this problem, the invention teaches that the transmitter and the receiver each consist of a plurality consists of vibrators assigned to a different plate thickness range, each of which is attached to the regularly assigned inner surfaces of a polygonal hollow body of rectangular cross-section attached and adjustable by means of an adjusting drive rotating the polygonal body in the transmitting or receiving position are.

Die durch die Erfindung erreichten Vorteile sindThe advantages achieved by the invention are

s darin zu sehen, daß unterschiedliche Plattendicken mit einem einzigen Ultraschallprüfkopf und optimalen Bedingungen geprüft werden können, weil die den unterschiedlichen Plattendickenbereichen zugeordneten Schwinger stets in gleiche Sende- bzw. Empfangslage gebracht werden. Die Handhabung ist sehr einfach, da der Verstellantrieb sowohl die Schwinger des Senders, als auch die Schwinger des gleich aufgebauten Empfängers verstellt.s to see that different plate thicknesses with a single ultrasonic probe and optimal Conditions can be checked because they are assigned to the different plate thickness ranges The transducer must always be brought into the same sending or receiving position. The handling is great simple, because the adjustment drive includes both the transducers of the transmitter and the transducers of the same structure Adjusted receiver.

Nach einer bevorzugten Ausführungsform der Erfindung besteht das Produkt aus Frequenz und Plattendicke aus dem Grundwellenbereich zwischen 90 und 160 kHz ■ cm. Hiermit läßt sich für jeden Plattendickenbereich unter Einsatz der geringst möglichen Zahl von Schwingern lückenlos eine optimale Ultraschallprüfung durchführen.According to a preferred embodiment of the invention the product of frequency and plate thickness consists of the fundamental wave range between 90 and 160 kHz ■ cm. This enables the smallest possible range of panel thicknesses to be used Number of transducers an optimal ultrasonic test without gaps carry out.

Im folgenden wird die Erfindung anhand! einer ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert.In the following the invention is based on! a drawing showing an embodiment in more detail explained.

Die einzige Figur zeigt schematisch einen Schnitt durch eine Vorrichtung zur Ultraschallprüfung von Blechband 1 mit einer Dicke von 1 bis 10 mm nach dem Impuls-Echo-Verfahren mit Lambwellen. Sie besteht in ihrem grundsätzlichen Aufbau zunächst aus einem Ultiaschaüprüfkopf mit einem Sender 2 undThe single figure shows schematically a section through a device for ultrasonic testing of Sheet metal strip 1 with a thickness of 1 to 10 mm according to the pulse-echo method with Lamb waves. she consists in its basic structure of an ultiaschaüprüfkopf with a transmitter 2 and

jo einem identisch aufgebauten Empfänger, der in der Figur nicht zu erkennen ist, weil er hinter dem Sender 2 angeordnet ist. Der Sender 2 ist in einem mit Wasser 3 gefüllten Gehäuse 4 mit einem Ankopplungsfenster 5 untergebracht.jo an identically structured receiver that is stored in the Figure cannot be seen because it is arranged behind the transmitter 2. The transmitter 2 is in one with Housing 4 filled with water 3 with a coupling window 5.

Der Sender 2 besteht im Ausführungsbeispiel aus sechs Schwingern 6a-f unterschiedlicher konstanter Frequenz. Welcher Schwinger mit welcher Frequenz welchem Dickenbereich zugeordnet ist, kann der nachfolgenden Tabelle entnommen werden:In the exemplary embodiment, the transmitter 2 consists of six oscillators 6a-f of different constant frequencies. Which transducer is assigned to which thickness range with which frequency can be seen in the following table:

SchwingerSchwinger

Frequenz/kHz Dicke/mmFrequency / kHz thickness / mm

6a6a 10001000 1,0- 1,51.0-1.5 6b6b 600600 1,6- 2,51.6-2.5 6c6c 400400 2,6- 3,72.6-3.7 45 6d 45 6d 300300 3,8- 5,03.8-5.0 6e6e 200200 5,1- 7,5 .5.1-7.5. 6f6f 150150 7,6-10,07.6-10.0

Wie unschwer überprüft werden kann, ist für alleHow easy it is to check is for everyone

so Schwinger 6a—f das Produkt aus Frequenz und Dikkenbereich relativ konstant und liegt dieses Produkt im günstigen Grundwellenbereich zwischen 90 und 160 kHz cm.Thus Schwinger 6a-f the product of frequency and thickness range is relatively constant and this product lies in the favorable fundamental wave range between 90 and 160 kHz cm.

Die Schwinger 6a—f sind auf die regelmäßig angeordneten Innenflächen eines Sechseckhohlkörpers 7 rechteckigen Querschnittes aufgekittet und vermittels eines den Sechseckhohlkörper 7 drehenden Verstellantriebes 8 in Sendelage bringbar. Die in Sendelage befindlichen Schwinger, im Ausführungsbeispiel 6/, erzeugen durch das Ankopplungsfenster 5 immer unter dem gleichen Winkel einen Longitudinalwellenzug zur Anregung einer Plattenwelle in dem Blechband 1. An dessen Oberfläche zurückgestrahlte Ultraschallanteile werden durch einen hinter dem Ankopplungsfenster 5 im Gehäuse 4 befindlichen Dämpfungskörper 9 absorbiert, um störende Überkopplungen zu vermeiden.The oscillators 6a-f are cemented onto the regularly arranged inner surfaces of a hexagonal hollow body 7 of rectangular cross-section and can be brought into the transmitting position by means of an adjusting drive 8 rotating the hexagonal hollow body 7. The transducers in the transmitting position, in the exemplary embodiment 6 /, generate a longitudinal wave train through the coupling window 5, always at the same angle, to excite a plate wave in the sheet metal strip 1. Ultrasonic components that are radiated back on its surface are reflected by a damping body 9 located behind the coupling window 5 in the housing 4 absorbed in order to avoid annoying cross-coupling.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (2)

Patentansprüche:Patent claims: 1, Vorrichtung zur Ultraschallprüfung von plattenförmigen Körpern, insbesondere Blechband, nach dem Impuls-Echo-Verfahren mit Lambwellen, bestehend aus einem einen Sender und einen Empfänger aufweisenden Ultraschallprüfkopf, wobei die konstante Frequenz eines Ultraschallschwingers für den Sender und für den Empfänger für jeweils einen anderen Plattendickenbereich so gewählt wird, daß das Produkt aus der Frequenz und dem zugeordneten Plattendickenbereich im wesentlich konstant ist, dadurchgekennzeichnet, daß der Sender (2) und der Empfänger je aus einer Mehrzahl von jeweils einem anderen Plattendickenbereich zugeordneten Schwingern (6a-6f) besteht, die jeweils an den regelmäßig angeordneten Innenflächen eines Vieleckhohlkörpers (7) rechteckigen Querschnitts befestigt und vermittels eines den Vieleckhohlkörper drehenden Verstellantriebs (8) in Sende- bzw. Empfangslage verstellbar sind.1, device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, according to the pulse-echo method with Lamb waves, consisting of an ultrasonic probe having a transmitter and a receiver, the constant frequency of an ultrasonic transducer for the transmitter and for the receiver for each other Plate thickness range is chosen so that the product of the frequency and the assigned plate thickness range is essentially constant, characterized in that the transmitter (2) and the receiver each consist of a plurality of transducers (6a-6f) each assigned to a different plate thickness range, which each attached to the regularly arranged inner surfaces of a polygonal hollow body (7) of rectangular cross-section and can be adjusted in the transmitting or receiving position by means of an adjusting drive (8) rotating the polygonal hollow body. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Produkt aus der Frequenz und dem zugeordneten Plattendickenbereich aus dem Grundwellenbereich zwischen 90 und 160 kHz · cm besteht.2. Apparatus according to claim 1, characterized in that the product of the frequency and the assigned plate thickness range from the fundamental wave range between 90 and 160 kHz · cm.
DE19762632323 1976-07-17 1976-07-17 Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves Expired DE2632323C3 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19762632323 DE2632323C3 (en) 1976-07-17 1976-07-17 Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves
FR7721628A FR2358658A1 (en) 1976-07-17 1977-07-13 Ultrasonic testing device for metal strips - has oscillators for different strip thicknesses with constant prod. of frequency by corresponding thickness
IT2566777A IT1084949B (en) 1976-07-17 1977-07-13 DEVICE FOR THE ULTRASONIC CONTROL BY PLATE-SHAPED BODIES, IN PARTICULAR FOR SHEET METAL TAPES, ACCORDING TO THE LAMB WAVE-IMPULSE-ECO PROCEDURE
JP8306977A JPS5312386A (en) 1976-07-17 1977-07-13 Ultrasonic flaw detector for inspecting plateelike objects*particularly strips by using lambert wave pulse echo method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762632323 DE2632323C3 (en) 1976-07-17 1976-07-17 Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves

Publications (3)

Publication Number Publication Date
DE2632323A1 DE2632323A1 (en) 1978-01-26
DE2632323B2 true DE2632323B2 (en) 1978-06-22
DE2632323C3 DE2632323C3 (en) 1979-02-22

Family

ID=5983321

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762632323 Expired DE2632323C3 (en) 1976-07-17 1976-07-17 Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves

Country Status (4)

Country Link
JP (1) JPS5312386A (en)
DE (1) DE2632323C3 (en)
FR (1) FR2358658A1 (en)
IT (1) IT1084949B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124855A1 (en) * 1980-06-25 1982-02-25 Hitachi Metals, Ltd. ICE DETECTOR

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538155B1 (en) * 1982-12-17 1988-08-12 Fragema Framatome & Cogema METHOD AND DEVICE FOR DETECTING DEFECTIVE FUEL ELEMENTS USING ULTRASONIC ABSORPTION
GB8509836D0 (en) * 1985-04-17 1985-05-22 Rolls Royce Transient stress wave events
JPS6443712A (en) * 1987-08-11 1989-02-16 Nippon Telegraph & Telephone Automatic level measuring instrument
JP4717338B2 (en) * 2003-08-29 2011-07-06 株式会社三葉製作所 Non-contact temperature measurement system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3124855A1 (en) * 1980-06-25 1982-02-25 Hitachi Metals, Ltd. ICE DETECTOR

Also Published As

Publication number Publication date
DE2632323C3 (en) 1979-02-22
IT1084949B (en) 1985-05-28
JPS5312386A (en) 1978-02-03
FR2358658A1 (en) 1978-02-10
DE2632323A1 (en) 1978-01-26

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